Properties of the glomerular barrier and mechanisms of proteinuria.

Abstract:

:This review focuses on the intricate properties of the glomerular barrier. Other reviews have focused on podocyte biology, mesangial cells, and the glomerular basement membrane (GBM). However, since all components of the glomerular membrane are important for its function, proteinuria will occur regardless of which layer is affected by disease. We review the properties of endothelial cells and their surface layer, the GBM, and podocytes, discuss various methods of studying glomerular permeability, and analyze data concerning the restriction of solutes by size, charge, and shape. We also review the physical principles of transport across biological or artificial membranes and various theoretical models used to predict the fluxes of solutes and water. The glomerular barrier is highly size and charge selective, in qualitative agreement with the classical studies performed 30 years ago. The small amounts of albumin filtered will be reabsorbed by the megalin-cubulin complex and degraded by the proximal tubular cells. At present, there is no unequivocal evidence for reuptake of intact albumin from urine. The cellular components are the key players in restricting solute transport, while the GBM is responsible for most of the resistance to water flow across the glomerular barrier.

journal_name

Physiol Rev

journal_title

Physiological reviews

authors

Haraldsson B,Nyström J,Deen WM

doi

10.1152/physrev.00055.2006

subject

Has Abstract

pub_date

2008-04-01 00:00:00

pages

451-87

issue

2

eissn

0031-9333

issn

1522-1210

pii

88/2/451

journal_volume

88

pub_type

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